Research topic:ocean

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ocean

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

ocean Continuous body of salt water that surrounds the continents and fills the Earth's great depressions. Oceans cover c.71% of the Earth's surface (more than 80% of the Southern Hemisphere), and represent c.98% of all the water on the face of the Earth. There are five main oceans, the Atlantic, Pacific, Indian, Arctic, and Antarctic. The oceans are constantly moving in currents, tides, and waves, and they form an integral part of the Earth's hydrological cycle and climate. They are a rich source of fossils and minerals, such as oil and gas. Marine fauna, such as fish and plankton, are a vital part of the food chain. Total area: 360 million sq km (138 million sq mi). Total volume: c.1.4 billion cu km (322 million cu mi). Average depth: 3500m (12,000ft). Average temperature: 3.9°C (39°F). See also Antarctica; continental drift; desalination; seafloor spreading; water pollution

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